tungsten minerals

The specific structure, technological characteristics and the operation principle of the spiral chute are briefly described in the paper, emphasis being laid on its practice of separating hematite, tin, tungsten, tantalum and niobium ores and other heavy minerals.

本文简要介绍了螺旋溜槽的结构特点，技术特性和选别原理。着重叙述了螺旋溜槽选别赤铁矿、锡矿、钨矿，钽铌矿和其它重矿物的选别实践。

Democratic Republic of Congo: Armed groups here battle over profits from gold, as well as tin, tantalum and tungsten ( also known as the "three Ts")-the so-called conflict minerals that are necessary to produce the specialized components of many electronic devices.

刚果民主共和国：这里的武装组织为了争夺黄金，以及锡、钽和钨（即“3T”）的利润而战斗。这些所谓的“争端矿物”是生产很多专业的电子产品元件所必须的。

Dodd-Frank, the American law designed to address the financial crisis, has a provision requiring companies to disclose if they were using minerals like tungsten and gold exported illegally from the Democratic Republic of Congo or neighboring countries.

旨在应对金融危机的联邦法律《多德-弗兰克法案》（Dodd-Frank）中有一条规定，企业必须披露，是否使用了刚果民主共和国或其邻国非法出口的钨和黄金等矿物。